Players aren't ready for the push as its no longer a battle for the ball, it never happens. It occurring on the odd Occassion could cause a serious injury like a broken neck.
I have no issue with the push, but if that is going to happen, then the original rules should be followed (scrum set correctly, ball in middle etc etc), so both sides are ready for the push.
The scrum wasn't even set correctly by ref with Manly not even locked in, when the push occurred.
Walker could have easily suffered a serious injury last night, I would have been annoyed if it was an eels half was injured.